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    <p>上一节课我们用到是&lt;hr noshade/&gt;标签</p>
    <p>史蒂夫&copy;</p>
    <p>算法&trade;</p>
    <p>芙蓉&reg;</p>
    <form action="">
        用户名<input type="text" name="username" placeholder="用户名"><br>
        密&emsp;码<input type="password" name="password" placeholder="密码">
    </form>
    <p>&#128512</p>
    <p>&#128517</p>
    <p>&#128513</p>
    <p>&#128514</p>
    <p>&#128515</p>
    <p>&#128516</p>
    <p>&#128526</p>
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